Improved burglar alarm



C. WATERMAN.

Burglar Alarm.

No. 63.124. Patented March 19. I867.

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IMPROVED BURGLAR ALARM.

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TO ALL WHOM IT MAY CONCERN:

Be it known that I, C. WATERMAN, of the city, county, and Statc'of New York, have invented a new and improved Burglar Alarm; andI do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to make anduscthe same, reference being had tothe accompanying drawings, forming part of this specification.v g

This invention relates to. a new and improved burglar alarm for doors and windows, and it consists in-a new and'improved means employed for lockingthe bell-hammer and liberating the same, as hereinafter fully shown and described, whereby the alarm, when a door or windowto which the inventiouis applied is partially opened, or opcued sufficieutly far to opcrate'tho alarm, cannot be stopped by suddenly closing thedoor or window.

Hence, a burglar, in opening a door or window, and causing the alarm tobe sounded thereby, cannot stop it by closing the door or window; and the inmates of a house,'therefore, will be sure to hear the alarm. In the accompanying sheet of drawingsv I 'Figure 1 is a vicwot' the inner side of a door having my invention applied to it.

Figure 2, a detached vicwof' the shell which contains the hammer-operating mechanism.

Similarlctters'ot' reference indicate corresponding parts. i

A represents a cylindrical case, which may be of sheet metal, or other suitable material, and which contains the mechanism of an ordinary bell alarm, therod- B of the bell-hammer extending through a slot, a, in the case, and-the latter-having a hook, C, attached, or other device for holding or looking the end of the rod B when it isnot designed to have the alarm operate, is the bell, against which the hammer E of the rod B acts. The

case A and bell D are secured to the door-frame just above the door A and-to the latter there is attached an arm, F, which has a rod, G, pivoted in its outer end, said rod being allowed to work 01' rise and fall freely to a certain extent. This rod G, when the door is closed,rcsts upon the hammer-rod B, and renders itinoperative by holding it down upon the bell; but when the door is opened the rod G of course is move-deli" from the rod B, and the latter is allowed'to operate, and the alarm consequently sounded. When the rod G is moved oil' from the hammer-rod B, the former drops, by its own gravity, out oflin'o with the hammer, and so that, in closing the door, the rod G will not come in contact with B, and thealarm therefore c'arinot be stopped. If it could be stopped by the closing of the door, the alarm would be sounded for such a short period that the inmates of a' house would, in many instances, fail to hear it. By my improvement,'therefore, the only way in which the alarm can he stopped is byobtaining a chair or step-ladder and adjusting the catch or fastening C; and this wouldoccupy some time, and be too much trouble to be practised by burglars. The book or fastening O is necessary, as it holds the hammer-rod B, and renders the alarm inoperative when not required, and admits of the hamme loperatin'g mechanism being always kept wound up rcady for use at any moment.

I claim as new, and desire to secure by Letters Patent--- 1. The rod G, connected by a pivot, or any suitable joint, to the arm F on the door A and arranged in relation with-the hammer-rodB of an ordinary bell alarm, to operate in the manner substantially as and for the purpose set forth. I v

2. The hook or fastening C, in combination with the hammer-rod B, and the other rod G, substantially as and for the purpose specified. v

The above specification of my invention signed by me this sixth day of February, 1867.

I O. WATERMAN.

Witnesses:

ALEX. F. Rosters, J. M. Covrxerox. 

